The recommended oxygen flow rate for patients with chronic obstructive pulmonary disease is 2-3L per minute. Oxygenation is necessary for patients with chronic obstructive pulmonary disease because many patients with chronic obstructive pulmonary disease have hypoxemia or respiratory failure. For patients with fingertip oxygen less than or equal to 88% and arterial blood gas analysis oxygen partial pressure less than or equal to 55 mmHg, long-term home oxygen therapy is recommended for about 10-15 hours per day. The reason for recommending continuous low-flow oxygenation is to avoid causing carbon dioxide retention, which can aggravate the patient’s condition, so the flow of oxygen in patients with chronic obstructive pulmonary disease is very important. Effective oxygenation can improve the patient’s oxygen deprivation and replenish the oxygen content of all organs of the body, thus improving the patient’s clinical symptoms, which is very beneficial for patients with chronic obstructive pulmonary disease.